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Binary compound. A binary compound is a chemical compound that contains exactly two different elements. Examples of binary ionic compounds include calcium chloride (CaCl2), sodium fluoride (NaF), and magnesium oxide (MgO), whilst examples of binary covalent compounds include water (H2O), and sulfur hexafluoride (SF6)
First of all, there is no compound absolutely defined as ionic. All ionic compounds have, to some even small extent, a covalent character, i.e., a supperposition of atomic orbitals aside the electrostatic interaction (if you are considering LCAO - linear combination of atomic orbitals for sake of simplicity).